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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > 335i oil temps
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      06-10-2013, 11:29 AM   #1
RadRyDawg
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Edit: Thanks RPM90
http://prodcds.bmwuniversity.com/library/Canada/Technical%20Training/Engines/BMW%20Petrol/N55%20(6-Cylinder)/English/N55%20-%20Product%20Information.pdf
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      06-10-2013, 02:52 PM   #2
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From the above:
12.2.3. Engine cooling

The advantages of the conventional cooling system are utilised for the cooling system with elec┬*tric coolant pump. The heat management determines the current cooling requirement and controls the cooling system accordingly. Under certain circumstances, the coolant pump can be completely switched off, e.g. to rapidly heat up the coolant during the warm-up phase. The coolant pump contin┬*ues to operate when the hot engine is shut down. The coolant capacity can therefore be varied irre┬*spective of the engine speed. In addition to the characteristic map thermostat, the heat management makes it possible to use various characteristic maps for controlling the coolant pump. In this way the engine control unit can adapt the engine temperature to the driving conditions.
The engine control unit regulates the following temperature ranges:

108 ┬░C = Economy mode
104 ┬░C = Normal mode
95 ┬░C = High mode
90 ┬░C = High mode and control with characteristic map thermostat

The engine management sets a higher temperature (108 ┬░C) when, based on vehicle operation, the engine control unit detects ÔÇŁEconomyÔÇŁ mode. The engine is operated with relatively low fuel require┬*ments in this temperature range. The internal engine friction is reduced at higher temperatures. The increase in temperature therefore realises low fuel consumption in the low load range. The driver wish┬*es to utilise the optimum power developed by the engine in ÔÇŁHigh and control with characteristic map thermostatÔÇŁ mode. For this purpose, the temperature in the cylinder head is reduced to 90 ┬░C. This temperature reduction promotes improved volumetric efficiency, thus resulting in an increased engine torque. Adapted to the relevant driving situation, the engine control unit can now regulate a defined operating range. In this way it is possible to influence the fuel consumption and power output through the cooling system.
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      06-10-2013, 03:25 PM   #3
johnofcross
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Impressive. Didn't such physics was in play just with cooling. Thanks.
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      07-15-2013, 06:54 AM   #4
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highly informative...does oil temperature also follow similar map ?
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      07-15-2013, 08:02 AM   #5
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So would running in high mode be better for the engine long term?
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      07-15-2013, 11:44 AM   #6
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I'd imagine so, since less friction results in less wear, probably negligible though.
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